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Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]          
Business Combination, Contingent Consideration, Liability Beginning Balance     $ 169    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases     190    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred     (22)    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ (13) $ (4) (12) $ (78)  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     (540)    
Payment of contingent consideration     (21)    
Business Combination, Contingent Consideration, Liability Ending Balance 305   305    
Business Combination, Contingent Consideration Arrangements [Abstract]          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         $ 780
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Business Combination, Contingent Consideration, Liability 305   169   305
Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]          
Business Combination, Contingent Consideration, Liability Ending Balance 201   201    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Business Combination, Contingent Consideration, Liability 201   201   201
Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]          
Business Combination, Contingent Consideration, Liability Ending Balance 104   104    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Business Combination, Contingent Consideration, Liability $ 104   $ 104   $ 104
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
contingent consideration liability, projected year of payment     2018    
contingent consideration liability, probability of payment         17.00%
Discount Rate, Fair Value Input     3.00%    
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
contingent consideration liability, projected year of payment     2018    
Discount Rate, Fair Value Input     11.00%    
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
contingent consideration liability, projected year of payment     2022    
contingent consideration liability, probability of payment         99.00%
Discount Rate, Fair Value Input     4.00%    
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
contingent consideration liability, projected year of payment     2026    
Discount Rate, Fair Value Input     15.00%